Design multicast services (SSM, PIM bidirectional, MSDP, service-reflection)
3 practice questions under this official exam objective (300-420) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
Multicast VoD Design Across Multiple ASes for High Availability
This question tests how to enable inter-AS multicast source discovery when each Autonomous System runs a local RP for performance. MSDP is the feature
RPF Check Purposes in Multicast Routing
The Reverse Path Forwarding (RPF) check prevents multicast routing loops and ensures packets arrive via the correct interface. This page explains that
MSDP Connects PIM-SM Domains to Deliver VoD Across ASes
The two offices are in separate multicast domains with their own RPs. MSDP (Multicast Source Discovery Protocol) peers the RPs across the domains so a